The utility model discloses a force measuring device suitable for under high temperature and high pressure environment has avoided wherein that stretch shaft adopts the sealing connection mode of moving with the autoclave among the prior art to need not consider the dynamic friction power of sealing washer, make the vice frictional force of friction directly to measure through force transducer andobtain that measured data is more accurate reliable, simultaneously, through adopting the direct dynamometry of force transducer under water that is applicable to normal atmospheric temperature highvoltage ring border that to buy on the market among this force measuring device, overcome because of not being applicable to the unsafe technical problem of measured data that force transducer broughtunder the high temperature high voltage ring border.